Bug 877960: followup to check the pref by default.
Merge remote-tracking branch 'upstream/master'
merge
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Revert "Merge pull request #10018 from huchengtw-moz/sms/Bug_875564_after_attaching_image_sometimes_send_button_is_still_disabled"

Bug 875564 - [MMS] after attaching image, sometimes send button is still disabled. r=steveck-chung

This reverts commit e19c6980de1089af7a120be4b49d49a6bb5d28e4, reversing
changes made to b3dd91ed197f96c698f03e1f67de3a7602d46880.
Merge remote-tracking branch 'upstream/master'
Bug 879411 - [Messages] Tapping <delete>/<backspace> removes the recipient to the left of cursor

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>